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It is the use of electromagnetic force and spring elastic force to achieve the connection and breaking of the contact. Ac contactor has two working states: power loss state (release state) and power state (action state). When the suction coil is energized, the static iron core generates electromagnetic attraction, the armature is sucked, and the connecting rod connected with the armature drives the contact.
Make the normally closed contact break contactor in a state of power; When the suction coil is powered off, the electromagnetic suction disappears, the armature is re-opened, the normally open contact is closed, and the bit spring is released, all the contacts are then reset, and the contactor is in a state of loss of power.
When the coil is powered off, the electromagnetic suction disappears, and the armature is released under the action of the release spring, so that the contact is restored, the normally open contact is disconnected, and the normally closed contact is closed. The working principle of a DC contactor is somewhat similar to that of a temperature switch.
